swap coil spring in fork for shorter

Daniel Hale

She fid, he fid, I fidn't
have a x-fusion metric w 160 coil in it, i’d like to cut it down to 130-140mm travel [i presume too expensive get an engineeer to physically do this-though i have have a spare 170mm travel spring i won’t ever use]
x-fusion don’t make shorter coil’s, can i just get another brands shorter spring at same diameter [29mm] and throw it in?
can i easily find out diff brand spring diameters?
 
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